Electrical resistance.



UNITED STATES PATENT OFFICE.

ELIHU THOMSON, OF SWAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

\ ELECTRICAL RESISTANCE.

1,039,463. i No Drawing.

To all whom it mag concern:

Be it known that I, ELIHU THOMSON, a citizen of the United States, residing at Swampscott, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electrical Resistances, of which the following is a specification.

This invention relates to electrical resistance and has for its object the provision shocks and jars to which it naturally would be subjected and the percentage of breakage in shipping would be'very high. Moreover carborundum wheel.

the specific resistance of pure silicon is not sufficiently high for many purposes.

In carrying out my invention I employ the element silicon mixed with inert materials. It has been found that silicon, when heated considerably aboveits melting point,-

wets and permeates masses, such as masses of sand, clay or ground quartz, loosely packed, with facility, giving a dark gray mass. This mass is quite toughand is of higher resistance than silicon itself. The

mixture may be molded into rods or bars of any desired shape.

Specification of Letters Patent. Application'filed September 18, 1909. Serial No. 518,378.

Patented Sept. 24, 1912.

mold of fused silica may be employed for heating the material. Any desired method of heating and molding the material may, however, be employed, the feature of my invention being the formation of a concrete product composed of silicon and an inert material. 4

Various modifications of my invention will suggest themselves to those skilled in the art without departing from the spirit of my invention, since it is understood that I do not limit the invention to the particular materials employed, nor the method of forming the same into resistance units except in so far as it is limited by the scope of the claims annexed hereto.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. A resistance comprising a mass of inert material impregnated with fused silicon.

2. A resistance unit comprising a porous mass of inert material permeated with fused silicon.

3. A strong, tough resistance material, having an electrical resistance higher than silicon, comprising a concrete of inert material and a binder of silicon.

at. A strong, tough resistance material, having an electrical resistance higher than silicon, comprising silicon and a substantial admixture of silicious material.

5. The process of making a resistance material which consists in making an intimate mixture of silicon and an inert material while the silicon is heated considerably above its melting point and shaping said mixture into desired form.

In witness whereof, I have hereunto set my hand this sixteenth day of September, 1909. a

I ELIHU THOMSON.

Witnesses:

JoHN A. MCMANUS, Jr., CHARLES A. BARNARD. 

